A publication listing all of the then-current Mergenthaler Linotype linecasting matrices by their numbers, along with information on matrices, matrix fonting schemes, keyboard layouts, and matrix characteristics and care. Printing code 610.11.3-K-XX-13X. This booklet is undated, but Jim Gard of the San Jose Printers' Guild has cracked the Mergenthaler publication code and determined that "K-XX" designates "11-59", or November 1959.
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